Prep and knowledge are the key to survival and helping someone put together a bag. I still say and teach that there is no right or wrong kit, these are very personal, and skill and AO dictate what is packed. I do not know everything and will never claim that I do. Even disagreement about the order of shelter, fire, water. Its a good training lesson to hand out a list of kit and have students prioritize them taking only 10 out of the 20 given on the list, then debate it.
Snaring or trapping: if you know how, what to look for, etc fine but many just want to or say include a snare/trap and have no idea how to actually go about snaring animals. In my book, snare may be more about long term survival but who is to say a short experience cannot turn into an long ordeal. Most bags have 72 hours of food, then what.
Plus most bug outs come from urban dwellers. Bush rats really do not need much of a go bag because they are less effected and have the skill set to survive already with kit in hand. Its hard to comprehend 1000 Anchortownites or Squarebankites leaving home with a bug out into the bush to survive, and this goes for any city USA.
I taught alpine travel mostly with the philosophy of light is right, lighter is righter and lightest in bestest. When I went to motel rooms or class room depending on whom, fit the kit to the pack not the pack to the kit. Find a good pack that fits you well with the bells and whistles you prefer, go down a size and then make your kit fit. Most users go find a backpack they like or is highly recommended by whomever, size does not matter, then get it home and fill it up. I prefer a true klettersak, a single main body with a single top pocket over the main body. The Greg Lowe clamshell design (assault packs) of the late 70s are all the rage with tact guys for whatever reason but I do not like the design for backcountry travel even though I have many. I am not a zipper lover or buckle lover, seen them fail in the backcountry.
Absolutely. flying bugs can drive someone insane real quick. 100 DEET and/or a Thermacell. My wife picked my up a Thermalcell when they first came to market. Yep, thought they were a sales gimmick. First time using one, strong believer now.
Hard candy, good one I forgot to list. Been taking hard candy on backcountry trips for a long time.
Also I like rocket fuel: chocolate covered coffee beans.